Optical Module Inclined Groove Lens Adjustment

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Solution Overview

Problem

Conventional head-mounted display devices with optical modules suffer from compromised imaging quality due to shifting optical axes during lens adjustment, and the circular shape of lenses interferes with the user's nose, causing discomfort.

Innovation Solution

An optical module design featuring a first and second lens assembly with guiding inclined grooves and a rotatable adjustment member that allows sliding motion parallel to the optical axis, preventing axis shift and enabling arbitrary lens shapes for improved comfort.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a rotating lens adjustment mechanism is used to adjust the distance between lenses, then the focal plane position can be adjusted, but the movable lens rotates causing the optical axis to shift and imaging quality to deteriorate

Engineering Contradiction:

Improvefocal plane position adjustment precisionVSAvoidoptical axis alignment precision

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

The adjustment mechanism is segmented into independent functional components: the guiding inclined groove handles the sliding motion along the optical axis, while the guiding member and adjustment member handle the rotation control. This segmentation allows each component to perform its specific function without interfering with the optical axis alignment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guiding inclined groove acts as an intermediary mechanism between the rotational adjustment and the linear movement of the lens. It converts the rotational motion of the adjustment member into precise linear sliding motion of the second lens, eliminating direct rotation of the lens itself and thus preventing optical axis shift.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If circular-shaped lenses are used in the adjustment mechanism, then the lens can rotate smoothly, but the structure interferes with the bridge of the user's nose causing discomfort

Engineering Contradiction:

Improvelens rotation smoothnessVSAvoidnose interference and wearing discomfort

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The lens shape is changed from circular to asymmetric D-shaped or rectangular with rounded corners. This asymmetric shape eliminates the need for rotational adjustment while still allowing smooth linear movement through the guiding inclined groove. The asymmetric shape also reduces the overall profile of the optical module, preventing interference with the user's nose bridge.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

Instead of using a circular lens that rotates to achieve adjustment, the invention inverts the approach by using a non-circular lens that slides linearly. The adjustment is achieved through the guiding inclined groove mechanism rather than through lens rotation, fundamentally changing the motion pattern from rotational to translational.

Inventive Principle:

Principle #13The other way round (Inversion)

3Manufacturing precision

If the second lens slides relative to the first lens along the optical axis, then the distance between lenses can be adjusted without axis shift, but the lens shape cannot be circular

Engineering Contradiction:

Improveoptical axis alignment stabilityVSAvoidlens shape flexibility

Core Design Contradiction:

Manufacturing precisionVSShape

Solution Approach 1:

The guiding inclined groove serves multiple functions: it guides the linear sliding motion of the second lens, constrains the lens to move only along the optical axis, and accommodates non-circular lens shapes. This universal guiding structure replaces the need for circular lenses and rotational adjustment mechanisms.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20240310600A1Optical module

Publication Date: 2024.09.19 PEGATRON

AI summary

An optical module includes a first lens assembly including a first lens holder and a first lens fixed to the first lens holder, a second lens assembly, and an adjustment member. The first lens holder has at least one guiding inclined groove having a first stroke end and a second stroke end. In a direction parallel to an optical axis of the first lens, a stroke difference is provided between the second and first stroke end. The second lens assembly includes a second lens holder slidably disposed in the first lens holder, a second lens fixed to the second lens holder, and at least one guiding member slidably disposed in the second lens holder and slidably connected to the guiding inclined groove. The adjustment member is rotatably sleeved on the first lens holder. The guiding member penetrates the guiding inclined groove to be coupled to the adjustment member.